Weston Universal Exposure Meter Model 617 User manual

How   to  Use  your
               WESTON  UNIVERSAL
                 EXPOSURE  METER





                  CAUTION

                       ‘When  aiming  the  Exposure  Meter
                                   at  the  scene   to  be  photographed,   do
                          not  allow  your   fingers   to  drop   be-
                        hind   the  meter   in  such   a manner   as
                               to  partially   cut   off  the   light  from
                          the  photoelectric   cells  which   are  be-
                       neath   the   glass  windows.
                          Direct  sunlight  does  not  harm  the
                      photo    cells  but    if             it     is  allowed   to
                         enter   the   cell  openings     it  will  cause
                     an_erroneous  reading   of  the  scene’s
                        brightness.





                                       Copyright,   1933
                         Weston    Electrical   Instrument   Corp.
donated to www.butkus.us

on   your   camera       is   1/25,    use   that   speed.    The
difference     is  extremely   slight,   and   the   latitude   of                                /  PROPER  CLASSIFICATION
all   present   day    film    fully  compensates    for   this
variation.     Also,     if   the   lens  opening   (stop  num-                                                                                                                                                                                   /'   OF  SCENES  WILL  IMPROVE
ber)   indicated    by   the  meter   does   not  appear   on           PHOTOGRAPHIC  RESULTS
your  camera   choose   the   next   nearest   stop  open-
ing   that   your  camera    has,     For   instance,     if  the
meter   indicates     {7   and    the   camera   reads    {5.6,                Uniformly   good    results    will   not    be   obtained6.3,    {8,   etc.,   set   the   lens   at   the   nearest  number,
6.3,    or   you   may   approximate   more   closely   by                                     if   all  scenes   are  considered    as  average.    The   Ex-
setting   the   lens  between    16.3  and    {8                             posure   Meter     dial   divides    the        various   types    of
                                                                          scenes  into  three  general  groups    as  shown,  namely, HOW   TO  USE  THE  METER  WITH
                                                                                    A,    B  and    C.     See    Fig.        4.
     YOUR  MOVIE  CAMERA
   The   normal   speed    of      a  movie   camera      is    16           A—Distant   Scenes—These   include   distant   land-
frames   per  second   but   the   actual   time    of  expo-                    scapes   and   sea   views   which,   because    of   their
sure   varies    for   different   cameras     in  accordance
with   the   design    of   the   shutter.    On   page     9    is    a                    distance   and   generally   small   shadow    areas,
table  showing    the   shutter   speeds    to   be   used   on                     require    less  exposure   than   average   scenes
the  exposure   meter    for   various   cameras.     Select
the  shutter   speed    of  your  own  camera   and   note          B—Normal  Scenes—These   include  average  scenes
how     it  varies  when   frame  speeds   other  than   nor-                  where    the   area    of   high   lights   and   shadows
mal   are    used.    Remember    that   only   the   figures                         are   approximately    equal    and   include    such
applying   to  your  own  camera  need   be  considered                      views     as   open    streets,   ordinary   landscapes,
Thus,                if  you               own   an                       Eastman                                                K   or                                          Filmo  71-A-B
two  speed             camera,                        you                             need   only                                  remember                                                              that                      portraits     in    the   sun    or   shade,   beach   and
 if  you   shoot    at  regular   speed,   the   shutter  speed                          river   scenes   and     all  normal   objects.
applying    is  1/32,  and  when  shooting   at  half  speed,
 the   shutter   speed       is     1/16.    No   other   figures            C-—Dark   Scenes    with   Strong   Contrast—These
 apply.       If  Super   Cine  Kodak   Pan.   film     is   used,                    include   scenes  having   dark  shadow   areas  and
which   has     a  speed    of   16,   the  arrow   on   the  white                    strong  contrasts   such    as   are  found    in  narrow dial  should    be  placed    at   16   on   the  bottom   black                                                                                           streets   among    high   buildings,    ravines   and
 dial                                                                              scenes   under    trees   with   heavy    foliage,    etc
                                                                                                       In  these  scenes  more   than  normal  exposure     is
                                                                             required
                                                                  Exposure   values     for   scenes   falling     in   class  A
                                                                                                or   C    are   determined    exactly     as   described    for
                                                                     average   scenes   except    that    the   A     or   C   scene
                                                                       arrow      is   used   instead     ‘of   the  Normal     B   arrow.
                                                                     The    arrows   marked  “DARKER   OBJECTS
                                                    WILL   BE  UNDER-EXPOSED"    and  “BRIGHT-
                                                               ER  OBJECTS   WILL    BE  OVER-EXPOSED™
                                                                                            are   used  when   fitting   the  brightness   range    of  the
                                                                              scenc     to   the    film   latitude     as   discussed     in   the
                                                                      booklet   described   on   page    15

                                                            [71

INTERIORS
                                              FOR  THE ADVANCED  AMATEUR
    For  photographing   interiors   the   use   of                   AND  PROFESSIONAL
photo   flood  lamps    is  suggested   to  increase                  PHOTOGRAPHER
and   round   out   the   illumination.    These                                                                                     For   those   more   advanced     in   the    art   of lamps    give   about    ten   times   more    light
than   the  ordinary   60   watt  lamp.                              photography    there    are   additional   methods
                                                                                                 of   obtaining   exposures    with    the   Weston
       Jse   the   same    plate   speeds   given     in
                                                                       Universal   Exposure   Meter,    by   which    the table   on   page     8   for  tungsten   (Mazda).
                                                                      brightness  range   in  the  scene  can   be   so   fitted
                                                                                                        to  the   film  range   or  latitude               as    to  obtain  any
                                                                             desired   average   density    in   the   negative,   and
                                                                                   special   lighting   effects

                                                                               This  information      is  contained    in   the  book-
       ZERO  SETTING                                                                let,  “Instructions    for  Advanced  Amateurs  and
  OF  INSTRUMENT  POINTER                            Professionals    for  Using   the  Weston   Universal
                                                                                                                                                                                                                                               " Exposure   Meter.”
  When   no   light  reaches   the   “elec-
 tric  eyes”    in  the  back   of  the  Expo-
sure  Meter   the  instrument   pointer
should    rest   directly   over   the   zero
position   on   the   scale.

     If   this     is  not   the   case   then   the
pointer  can   be  readily   set   to   its  zero
position  by  slightly  turning   the  zero
corrector   located    in   the   glass   over
the  instrument   scale.

  ‘When  making   this  correction  place
the  meter  back  downward   on  some
opaque   object,    as    a  card   or    a  book
50   as   to  exclude    all   light  from   the
photoelectric   cells,  and  hold     it   at  an
angle   of  about   45°.




                  {141                                 15}